It was clear from the moment the Celtics traded Paul Pierce and Kevin Garnett that Jeff Green’s role would be changing. Yesterday he seemed to believe said role was that of basketball court jester.As the club went through its media day paces Green photobombed his teammates. He danced in their sight lines to get them laughing during their interviews. He asked Kelly Olynyk what conditioner he used.

“I’m having fun” Green said. “I’ve just been enjoying media day and my teammates.”

Later he indicated things would be different when the 2013-14 bell rings today in Newport R.I. and for the next several months.“I’m going to continue to take the words of Kevin Garnett and be an (expletive) be aggressive and just continue to improve my game this year next year and the year after that” Green said. “I’ve just got to keep working.”

He smiled a bit with the cuss a reference to last November’s win in Milwaukee after which KG said “You know Jeff’s a really really nice guy and some nights you know you’ve just got to be an (expletive). You’ve got to be . . . I can’t really say what I want to say but he’s got to be that.”

Green was that night with 12 points including a major dunk that helped propel the Celts. Now six years after he was drafted and a year and a half following surgery to repair an aortic aneurysm Green says he’s ready for more.

“It’s all about the next step” he said. “Now they’re gone if you haven’t realized so now we have to focus on what we have to do. They’re not here anymore so I can’t dwell on them being gone.“Now I have the opportunity that every player wants — to be that guy. I’m looking forward to this journey that I’m about to endure. It should be fun.”

Green admitted to being a bit tentative when he came back last fall after missing the 2011-12 season. He had a very strong exhibition run but he seemed to fade at times until a late-season surge. He arrives this fall with no physical concerns.

“I feel good” Green said. “This has been the first summer where I didn’t have to rehab. I didn’t have other obligations as far as school (finishing work on his degree) where I had to be or report to. So this year I was able to put all the focus and time into getting better on the court. So I feel good. My conditioning is there. My game is there. I think I’m just in better condition and then I think my game has improved a little bit. Last year was mainly just getting back on the court and recovering from surgery.”